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Aiming at finding the $k$ nodes with the highest readings among sensor nodes, top- $k$ query is a very important and useful query in wireless sensor networks (WSNs). Current studies about top- $k$ query in WSNs mainly focus on always-on WSNs (A-WSNs) where sensors always stay awake and little research pays attention to top- $k$ query in duty-cycled WSNs (D-WSNs) in which sensors are dynamically...
In this paper, we propose an energy-efficient data gathering method, which is an extension of our previous method, to further reduce traffic in wireless sensor networks. Our previous method suppresses the energy consumption by traffic reduction utilizing spatial and temporal interpolation. In the extended method, each node appropriately utilizes either of spatial or temporal interpolation according...
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